Yes, planeswalkers can be commanders, but only the ones that specifically say This card can be your commander are allowed to lead a Commander deck
Its not a backbreaking effect on its own, but its definitely annoying enough to land it here on the list
For four mana, you get a Black, Red and Green 3/3 with haste that allows you to create a tapped treasure token whenever a creature with haste attacks
This hasty creature shuts down a players ability to block with any of their creatures for a turn, leaving them wide open for you to swoop in with an army of attackers
It also gives all land cards in your graveyard dredge 2 so instead of drawing, you can return a land from your graveyard to your hand and mill two cards, keeping lands flowing back into play
I initially likened it to Boros Elite, a potent one drop that needs a little bit of setup